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Core sketch algorithms used alone and by other Java repositories in the DataSketches library.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.datasketches.theta;
import org.apache.datasketches.memory.Memory;
/**
* @author Lee Rhodes
*/
class MemoryHashIterator implements HashIterator {
private Memory mem;
private int arrLongs;
private long thetaLong;
private long offsetBytes;
private int index;
private long hash;
MemoryHashIterator(final Memory mem, final int arrLongs, final long thetaLong) {
this.mem = mem;
this.arrLongs = arrLongs;
this.thetaLong = thetaLong;
offsetBytes = PreambleUtil.extractPreLongs(mem) << 3;
index = -1;
hash = 0;
}
@Override
public long get() {
return hash;
}
@Override
public boolean next() {
while (++index < arrLongs) {
hash = mem.getLong(offsetBytes + (index << 3));
if ((hash != 0) && (hash < thetaLong)) {
return true;
}
}
return false;
}
}
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